2.5L head gasket

Heads, valves, pistons, rods, crankshaft, etc...

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thatsme87
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2.5L head gasket

Post by thatsme87 » Sat Apr 08, 2017 6:19 am

So my car is over heating, I believe it is the head gaskets, one is leaking externally oil or the oil pressure sensor is leaking, making it a little harder to tell on the passenger. On the driver side there is a very small amount of oil. With the car running I cam see bubbles now and then in the over flow tank and I think heavy moister in the exhaust. But how do I now which cylinder head is leaking? And can they be changed in the car or remove the engine?

Legacy777
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Re: 2.5L head gasket

Post by Legacy777 » Sun Apr 09, 2017 5:11 pm

I'd recommend pulling the spark plugs and see which plug looks different.

The headgaskets can be changed with the engine in the car, but it's a pain in the butt.
Josh

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
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thatsme87
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Re: 2.5L head gasket

Post by thatsme87 » Sun Apr 09, 2017 5:18 pm

So far I've taken the passenger side head off, in the car and know I an working on Taking the drivers side off. I forgot to mention that this is the 2.5 DOHC engine. I am also curious about how the FAL-PRO MLS head gasket does that's the best the auto parts store can order in are they any good? Or should I order a different one off line?

thatsme87
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Re: 2.5L head gasket

Post by thatsme87 » Sun Apr 09, 2017 5:22 pm

Thank you josh, it's been fun so far the passenger side was not to bad the spark plugs both looked wet and inside the cylinder looks like it was damp. I am just assuming that you should probably change both had gaskets at the same time is this true?

Legacy777
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Re: 2.5L head gasket

Post by Legacy777 » Sun Apr 09, 2017 5:32 pm

If the other side isn't leaking it's not mandatory to change it.
Josh

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

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thatsme87
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Re: 2.5L head gasket

Post by thatsme87 » Wed Apr 12, 2017 4:48 pm

I am having the heads milled and then I am looking at putting the heads back on with Fel-Pro 26167 PT MLS perma tex head gaskets any thoughts on these they sound good.

Alphius
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Re: 2.5L head gasket

Post by Alphius » Thu Apr 13, 2017 7:18 am

Use the Subaru OEM gaskets. The Fel-Pro are known to fail again posthaste.

cj91legss
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Re: 2.5L head gasket

Post by cj91legss » Thu Apr 13, 2017 1:23 pm

thatsme87 wrote:I am having the heads milled and then I am looking at putting the heads back on with Fel-Pro 26167 PT MLS perma tex head gaskets any thoughts on these they sound good.
Always choose oem unless you're putting together a fun car then cometic is what I would use.
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thatsme87
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Re: 2.5L head gasket

Post by thatsme87 » Fri Apr 14, 2017 5:33 pm

Very cool I will do that thank you I just got the heads back so I will be putting it back together hopefully this weekend

WRXish
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Re: 2.5L head gasket

Post by WRXish » Mon Feb 26, 2018 12:54 am

question on the head gasket....I read on NAUSIOC :) some of these guys that are building really high power 400 hp motors and up are using pure copper head gaskets...any experience with those and are they recommended?

Legacy777
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Re: 2.5L head gasket

Post by Legacy777 » Mon Apr 09, 2018 5:57 pm

I know this is an old post, but regarding the pure copper head gasket, that's BS. Copper has a melting point of 1,984°F, so if copper is being used it's an alloy and/or has steel cylinder sealing gaskets.

What did Nasioc say the benefit of copper was?
Josh

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1997 Impreza OBS

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Re: 2.5L head gasket

Post by Omega79 » Wed Apr 11, 2018 10:05 pm

cj91legss wrote:
Always choose oem unless you're putting together a fun car then cometic is what I would use.
+1 on this IMO. I hate to say, with the EJ25D, if one gasket has gone, the other probably will too. I haven't heard of anyone having enough luck with that specific engine replacing one side and being good to go for a while.

I've been down the same road. Great engine except for that one freaking thing.
lucas wrote:There were multiple Legacys with 300k+ miles. Jesus will return on a Turbo Lego.

icrman
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Re: 2.5L head gasket

Post by icrman » Mon Apr 30, 2018 8:51 pm

Legacy777 wrote:I know this is an old post, but regarding the pure copper head gasket, that's BS. Copper has a melting point of 1,984°F, so if copper is being used it's an alloy and/or has steel cylinder sealing gaskets.

What did Nasioc say the benefit of copper was?
This may help.

http://scegaskets.com/wp_super_faq/give ... ad-gasket/

Legacy777
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Re: 2.5L head gasket

Post by Legacy777 » Tue May 01, 2018 5:41 pm

Thanks for sharing.
Josh

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

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